I have a 2006 Tundra with 25000 miles and I'm going to change the plugs. My manual says they're irridum, but does not give a gap. What plugs do you recommend and what is the gap? Also, is there anything else I need to know? It looks like you take off the outer small bolt that's holding down the wire cover, remove it from the plug and then change the plug in the usual manner. I'm thinking maybe NGK plugs, or should I stay with Toyota?
go to Spark plug, Spark plug wire, spark plug gap, spark plug cross reference and ignition wires at Sparkplugs.com. they sell several types of plugs and will list the specified gaps per model. (.032 for most 4.7's, i think) Toyota uses either NGK or Denso or a mixture of both, sometimes.
Yes, remove the bolt(10MM ithink) and pull the coil pack. Replace the plug and the coil pack. It's a piece of cake. You will need about a 6'' extension and a good plug socket as the plug is recesssed.
If your plugs are iridium, you shouldn't need to replace them yet. They should last close to 100k. They are expensive.
I used Autolite platinums (AP3923) from Walmart in both my 99LC and my tundra. I changed them on the LC at 70K, though it was running fine, and noticed no difference when I changed them.
Last edited by labountyphoto; 02-12-2009 at 04:07 PM.
Iridiums come pre-gapped and you cant regap them (the electrodes are so hard that they will break if you try to).
I wouldnt buy them for the dealer, just go to your local auto parts store and buy them. They are no different than the ones you buy at the dealership and will be less expensive.
Make sure you stay with either Densos or NGKs.
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My manual says they're irridum, but does not give a gap.
Your manual says do not adjust the gap and your manual says exactly what Denso plug to use. Auto parts store Denso's & NGK's may come with wider gaps than your factory original plugs (which hurts performance & fuel economy) because they are intended for a bunch of different car makes so it's safer to buy genuine Toyota Denso's from a discount Toyota dealer like Bob Bridge Toyota (1sttoyotaparts.com) whose prices are comparable to sparkplugs.com, Autozone, etc.
Save your factory original plugs so you'll always know what gaps the factory originals were set to.
25K miles is kinda early to change iridium plugs, but it's good to change them more often than the factory manual 120K mile interval to maintain top fuel economy which in turn mimimizes emission system deterioration and the associated possibility of needing TWO new $1000 catalytic converters at around 100-150,000 miles.
As Dougg mentioned, use some anti-seize on the threads of the plugs
when you replace them or if you just check and reinstall the ones
that are there now. You can usually buy a pack of the stuff for .99 cents.
I use it so much I own a container of it. I also use dielectric spark plug
grease in the ends of the coil packs before putting them back in.
No antisieze on plugs as they contaminate O2 sensors (though antisieze says sensor safe). Put some gear oil on it and tighten it to 10-20 lbs.
Yeah, 30K is too early. I would not touch it till it hits 80K (after that anyway u are on your own, you can put anything, NGK, OEM, OTC).
Sticking with OEM or what the owners manual details is my sound advice. I would just stick with stealership, just buy and install, they are already pregapped by OEM manufacturer to meet Toyota standards.
Hey, I have an 03 Tundra.
Do u know if the E3 Spark plugs are good ones? Im wanting to get a high quality spark plug, around 6$. What would u guys get?
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Your manual says do not adjust the gap and your manual says exactly what Denso plug to use. Auto parts store Denso's & NGK's may come with wider gaps than your factory original plugs (which hurts performance & fuel economy) because they are intended for a bunch of different car makes so it's safer to buy genuine Toyota Denso's from a discount Toyota dealer like Bob Bridge Toyota (1sttoyotaparts.com) whose prices are comparable to sparkplugs.com, Autozone, etc.
Save your factory original plugs so you'll always know what gaps the factory originals were set to.
25K miles is kinda early to change iridium plugs, but it's good to change them more often than the factory manual 120K mile interval to maintain top fuel economy which in turn mimimizes emission system deterioration and the associated possibility of needing TWO new $1000 catalytic converters at around 100-150,000 miles.
Are you saying that a wider gap hurts fuel economy and performance? I had .030 in the truck and replaced with .040 (Denso). My highway MPG's are up at 20 MPG for the first time since I have owned the truck.
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No antisieze on plugs as they contaminate O2 sensors (though antisieze says sensor safe). Put some gear oil on it and tighten it to 10-20 lbs.
I've used Anti-seize on all my plugs, even in iron heads, for 20 years and I've never had a problem with contamination. I wouldn't think of installing plugs in aluminum heads without anti-seize.
On the broader topic:
1. 25K is way too early. Find another project
2. As expensive as these plugs are, source them online.
3. NGK or ND will do just fine. No need to go to the dealer. I wouldn't use any other brand, regardless of how impressive their ads are.
4. A difference in gap of .030 to .040 won't hurt anyone. If you put a plug in with a gap of .090, that might be a problem.
Just a note, irridium should never be adjusted. The electrode is very fragile and can crack easily, that's why they tell you not to gap these.
Agreed to use antiseize, but only a very small amount is needed. putting excess on can damage emissions equipment. Also, the gap can and does make a difference. More gap = more spark which can mean a more complete burn. Of course at some point the gap is too big for the ignition system and can 'blow out' or not ignite causing a misfire (more common on forced induction stuff) If you've ever seen bad plug wires arc you know the spark can jump a good amount. It's the quality of the spark that's important.
I'm seeing a slightly rough idle at 65k (06' DC) I guess I'll pull the plugs to see how they look, didn't realize they're intended for up to 100k. Figured it might help mpg too.
Brian
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Spark Plug Help
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